Yes. It's not just identity either, but practicality. That midfield 2 are not good enough to receive the ball and pass it forward. Both were shown up by Chirevella a lad who's about to turn 23, and has in truth looked semi competent in the Dutch league. He's a championship player. And he performed the key functions required of a central midfielder better than our 2.
I remember Roy Keane saying, that Brian Clough said to him, can you pass? Can you run? Can you tackle? The answer was a yes to all, so Clough said "well just do that then". People laughed when Keane said it, but he went on to say, you'd be amazed at how many professional players can't do those things, maybe they can do 1 or 2 but not all 3. Thats basically Sigurdsson and Schneiderlin.
To go back to point, Ancelotti's credibility will take a hit if he persists with trying to get Yerry Mina, Jordan Pickford, Sigurdsson, Schneiderlin etc to play out like Barcelona. It will not end well. He's a wonderful manager, but we have seen 3 managers fall on that alter before him.